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10 Cards in this Set
- Front
- Back
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99.999%
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On the Public Switched Telephone Network, the availability target is usually __________.
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jitter
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is variation in latency between successive packets; makes voice and music speed up and slow down over milliseconds
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Why is jitter a problem?
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usually in music and video; you see pauses between things due to change in latency in the system due to networking issues and the system response
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application response time
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equals two-way networking latency plus contributions to delay from the two hosts and the two applications problems; contributes to jitter; not purely a network matter
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user experiences
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To control application response time, networking,
server, and application people must work together to improve ____________. |
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Service Level Agreements (SLA)
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◦ Guarantees for performance
◦ Increasingly demanded by users ◦ Penalties if the network does not meet its QoS metric guarantees; cannot be met 100% of the time |
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SLA for Jitter
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no higher than 2% variation in packet arrival time 99% of the time
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SLA for Latency
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no higher than 125 ms 99% of the time
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SLA for Availability
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no lower than 99.99% (does not include percentage of time)
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worst-case scenario; minimum to be tolerated
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SLAs specify
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